§ Viscount Hinchingbrooke
asked the Paymaster-General the factors instrumental in maintaining the present high prices of coke; how many quality grades are now in operation; and whether these can be increased so that the poorer qualities can be reduced in price.
§ Sir I. Horobin
The price of coke is determined by commercial considerations regarding the cost of carbonising coal, the price of gas and by-products, the level of prices of competing fuels, and the fact that one ton of coal carbonised yields just over half a ton of coke and some 70 therms of gas.
With minor exceptions there is only one quality grade for gas coke and one for hard coke. Quality considerations do not justify classification into additional grades.